1. What is the tectonic setting of the large 2011 Tohukuearthquake in Japan?

a. slip along a transform fault that cuts through Japan

b. slip along a transform fault that is just offshore to thenorth

c. rifting in the Sea of Japan, west of the island

d. slip along a subduction zone (megathrust)

2. Why does the United States have such varying risks of seismicactivity?

a. Some areas are near plate boundaries, while others arenot.

b. Some regions in the continental interior have active faultsystems.

c. Volcanic activity can cause seismic risk in some areas.

d. These are all reasons the United States has varying risks ofseismic activity.